About Attribute Option Combos

I came across this great post on the CoP from Jim Grace discussing AOCs. Below is a snippet but he also provided this awesome slide deck: As it ages I expect that it will still be valid as it is related to the core data model.

With attribute option combos you can add any number of additional, independent, user-defined dimensions to a data set. They are made in the same way as category option combos: You define one or more categories that have options, and you combine these categories into a category combo.

Here are some comparisons between category option combos and attribute option combos:

Category option combo:

Used for data element disaggregations
Category combo is assigned to a data element
All combo values can be entered in a single data set form instance
Combos are selected by entering data into different fields

Attribute option combos:

Used for extra dimensions for an entire data set
Category combo is assigned to a data set
Only one combination can be entered on a single data set form instance
Category options are chosen by dropdown menu(s) for the entire form

https://community.dhis2.org/t/whats-mean-of-attribute-option-combos/4766